Astm D 6354 - 12.Pdf

Designation D6354 − 12 Standard Guide for Sampling Plan and Core Sampling of Carbon Cathode Blocks Used in Aluminum Production1 This standard is issued under the fixed designation D6354; the number im[.]

Designation: D6354−12

Standard Guide for

Sampling Plan and Core Sampling of Carbon Cathode

This standard is issued under the fixed designation D6354; the number immediately following the designation indicates the year of

original adoption or, in the case of revision, the year of last revision A number in parentheses indicates the year of last reapproval A

superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

1 Scope*

1.1 This guide covers sampling of carbon cathode blocks

used in the production of aluminum, and details procedures for

taking samples from single cathode blocks It covers

equip-ment and procedures for obtaining samples from cathode

blocks in a manner that does not destroy the cathode block or

prevent its subsequent use as originally intended However, the

user must determine the subsequent use of the sampled cathode

blocks Preferred locations for taking samples from single units

of cathode blocks are covered in this guide

1.1.1 Information for sampling of shaped refractory

products, in general, is given in ISO 5022 This standard details

the statistical basis for sampling plans for acceptance testing of

a consignment or lot Cathode blocks used in the production of

aluminum have specific requirements of sampling, and while

the statistical basis for sampling given in ISO 5022 applies,

further or modified requirements may also apply

1.2 The values stated in SI units are to be regarded as

standard No other units of measurement are included in this

standard

1.3 This standard does not purport to address all of the

safety concerns, if any, associated with its use It is the

responsibility of the user of this standard to establish

appro-priate safety and health practices and determine the

applica-bility of regulatory limitations prior to use.

N OTE 1—The following ASTM standards are noted as sources of useful

information: Test Methods C559 , C611 , C651 , C747 , C1025 , C1039 , and

C1225

2 Referenced Documents

2.1 ASTM Standards:2

C559Test Method for Bulk Density by Physical

Measure-ments of Manufactured Carbon and Graphite Articles

C611Test Method for Electrical Resistivity of Manufactured Carbon and Graphite Articles at Room Temperature

C651Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at Room Temperature

C747Test Method for Moduli of Elasticity and Fundamental Frequencies of Carbon and Graphite Materials by Sonic Resonance

C1025Test Method for Modulus of Rupture in Bending of Electrode Graphite

C1039Test Methods for Apparent Porosity, Apparent Spe-cific Gravity, and Bulk Density of Graphite Electrodes

C1225Specification for Fiber-Cement Roofing Shingles, Shakes, and Slates

2.2 ISO Standards:3

ISO 8007-1Carbonaceous materials used in the production

of aluminum - Cathodic blocks - Sampling plan and sampling from single cathodic blocks

ISO 5022Shaped refractory products - Sampling and accep-tance testing

3 Terminology

3.1 Definitions of Terms Specific to This Standard: 3.1.1 cathode block, n—one manufactured unit used as a

negative carbon electrode

3.1.2 sample, n—a portion of carbon obtained from a

cathode block

3.1.3 test specimen, n—a representative piece of a sample.

4 Significance and Use

4.1 Core sampling is an acceptable way of obtaining a test specimen without destroying the usefulness of a cathode block 4.1.1 Test specimens obtained by this guide can be used by producers and users of cathode blocks for the purpose of conducting the tests inNote 1to obtain comparative physical properties

1 This guide is under the jurisdiction of ASTM Committee D02 on Petroleum

Products, Liquid Fuels, and Lubricants and is the direct responsibility of

Subcom-mittee D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.

Current edition approved April 15, 2012 Published May 2012 Originally

4.2 Sampling shall not weaken the cathode block or increase

the likelihood of premature failure Extreme care shall be

exercised when taking vertically drilled samples

5 Apparatus

5.1 Core Drill Bit, similar to that shown inFig 1, driven by

suitable equipment Use bits with cutting teeth coated with

diamond or other extremely hard material

6 Procedure

6.1 Sampling locations for cathode blocks that were

vibrated, pressed, or extruded without a collector bar slot will

differ from those cathode blocks that were formed with

collector bar slots

6.1.1 For cathode blocks without collector bar slots,

samples shall be drilled from the part of the cathode block that

will be machined out for the slot, as shown inFig 2 Care is to

be taken to ensure that cores drilled vertical to the slot do not

penetrate beyond the depth of the slot

6.1.2 For cathode blocks with collector bar slots, samples shall be drilled from the cathode block, as shown inFig 3 If the user determines that cathode blocks with sample holes drilled in them cannot be used in the electrolysis process, then

it will be necessary to obtain a number of cathode blocks with the extra length, as shown inFig 3 The extra length will then have to be removed prior to cathode block use

6.2 Dimensions of a cored sample will depend upon the test that is to be performed on the sample The minimum dimension (usually the diameter) shall be at least three times the maxi-mum particle size of the dry aggregate used in the manufacture

of the cathode block Reference should be made to the standards relating to the tests to be performed to ensure that the samples taken are to suitable dimensions

6.2.1 The specific dimensions of the test specimens to be tested are normally given in the appropriate ASTM standard Where a standard does not specify the dimensions of the test specimen, a diameter of 30 or 50 mm is recommended The length of the test specimens should be at least one and a half times the diameter

6.3 Place the core drill bit firmly against the cathode block Take care to maintain the bit level and true Do not stop until the bit is embedded its full length Compressed air can be used

to cool the drill bit and remove dust while drilling Do not use water or other liquids to cool the drill bit

6.3.1 To remove the bit, pull and twist it by hand, or carefully withdraw the drill bit while it is rotating To remove the sample, insert a wedge between it and the cathode block until the core snaps

7 Report

7.1 The sampling report shall include the following: 7.1.1 Names of producer and customer,

7.1.2 Manufacturer’s identification of the lot or batch of cathode blocks being sampled,

7.1.3 Reference to this guide, 7.1.4 Date and place of sampling, 7.1.5 If extra length cathode blocks were available for sampling, the proportion and number are to be noted, 7.1.6 Sketches, similar to those inFig 2andFig 3, showing the location of the sampling locations and the direction of sampling (horizontally or vertically),

7.1.7 The dimensions of the samples, 7.1.8 Identification of the people doing the sampling, and 7.1.9 Complete details of sampling plan being followed

8 Keywords

8.1 anthracite; carbon; cathodes; core; graphite; sample; sampling; test specimens

FIG 1 Typical Core Drill Bit

SUMMARY OF CHANGES

Subcommittee D02.05 has identified the location of selected changes to this standard since the last issue (D6354–98(2008)) that may impact the use of this standard

(1) Updated Section3

FIG 2 Sampling from Single Units Produced Without Slot

FIG 3 Sampling from Single Units Produced with Slot

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